Vallis, N. Craievich, P. Fortunati, R.F. Ischebeck, R. Ismaili, E. Juranič, P.N. Marcellini, F. Orlandi, G.L. Schaer, M. Zennaro, R. Zykova, M. JACoW Publishing Geneva, Switzerland 2673-5350 978-3-95450-236-3 10.18429/JACoW-IBIC2023-MOP010 English 54-58 diagnostics simulation pick-up positron experiment Contribution to a conference proceedings 2023 2023-12 https://doi.org/10.18429/JACoW-IBIC2023-MOP010 https://jacow.org/ibic2023/papers/mop010.pdf This paper is an overview of a diagnostics setup for highly spread e⁺e⁻ beams, to be installed at the PSI Positron Production (P³ or P-cubed) experiment. To be hosted at the SwissFEL facility (PSI, Switzerland) in 2026, P³ is e⁺ source demonstrator designed to generate, capture, separate and detect nano-Coulombs of secondary e⁺ and e⁻ bunches, in spite of their extreme tranverse emittance and energy spread. The experiment will employ an arrangement of broadband pick-ups (BBPs) to detect simultaneously the time structure of secondary e⁺e⁻ bunches. A spectrometer will follow the BBPs and deflect the e⁺ and e⁻ onto two unconventional faraday cups that will measure their charge. In addition, the energy spectrum of e⁺ and e⁻ distribution will be reconstructed through scintillating fibers.